Red light variation an effective alternative to regulate biomass and lipid profiles in phaeodactylum tricornutum

Sharma, N., Fleurent, G., Awwad, F., Cheng, M., Meddeb-Mouelhi, F., Budge, S. M., Germain, H. et Desgagné-Penix, I. (2020). Red light variation an effective alternative to regulate biomass and lipid profiles in phaeodactylum tricornutum. Applied Sciences, 10 (7). Article 2531. ISSN 2076-3417 DOI 10.3390/app10072531

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Résumé

Abstract

Marine water diatom Phaeodactylum tricornutum is a photosynthetic organism that is known to respond to the changing light environment and adapt to different temperatures to prevent photoinhibition and maintain its metabolic functions. The objective of the present study was to test whether light shift variations in different growth phases impact the growth and lipid metabolism of P. tricornutum. Thus, we investigated R exposure in different growth phases to find the most effective light shift condition. The results showed that substituting white light (W) by red light (R) under autotrophic conditions, a condition called red shift (RS), increased biomass and lipid content compared to levels found under continuous W or R exposure alone. We observed an increase by 2-fold biomass and 2.3-fold lipid content in RS as compared toW. No significant change was observed in the morphology of lipid droplets, but the fatty acid (FA) composition was altered. Specifically, polyunsaturated FAs were increased, whereas monounsaturated FAs decreased in P. tricornutum grown in RS compared toWcontrol. Therefore, we propose that a light shift during the beginning of the stationary phase is a low-cost cultivation strategy to boost the total biomass and lipids in P. tricornutum.

Type de document:	Article
Mots-clés libres:	Light shift Phaeodactylum tricornutum Biomass Microalgae Lipids Autotrophy Metabolites
Date de dépôt:	22 avr. 2025 19:24
Dernière modification:	22 avr. 2025 19:24
Version du document déposé:	Version officielle de l'éditeur
URI:	https://depot-e.uqtr.ca/id/eprint/11865

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